Specifications

1.Non-Standards
2.OD:79.4mm-279.4mm
3.Certifactes: ISO ,API 7-1
4.Moq: 2tons
5.Spiral Drill Collar DC

Integral heavy weight  Drill Pipe

The drill collars are made of modified AISI 4145H chromium molybdenum alloy steel. These drill collar bars are full-length heat treated and water quenched to obtain ASTM A-370 mechanical properties. Full mechanical and chemical mill test certifications are supplied with all drill collars. These mill test certifications guarantee a hardness range of 285 to 341 BHN and an impact value of 40 ft.-lbs. at room temperature one inch below the surface.

 

1. Usage : One of the most important components of the drill string is to provide drilling bit ofpressure and the drill string rigid role.

2. Standard : API 7, API 7-1 and SY/T standards.   

3. Material : AISI 4145 H .

4. Types:drill pipes anddrill collars

5 Size : OD : 3 1/8”---11”, Length : 10’---31’